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L6981 数据表(PDF) 33 Page - STMicroelectronics

部件名 L6981
功能描述  38 V, 1.5 A synchronous step-down converter with low quiescent current
PDF  49 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6981 数据表(HTML) 33 Page - STMicroelectronics

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Figure 35. Power losses VIN = 24 V; VOUT = 5 V; FSW = 0.4 MHz
0
1
2
3
4
5
6
7
8
9
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
0.2
0.4
0.6
0.8
1
1.2
1.4
IOUT [A]
VIN = 24 [V]; VOUT = 5 [V]; FSW = 400 [KHz]
LCM
LNM
POUT
The following three figures show the efficiency and power losses acquired on the standard evaluation board of the
device, selecting the following output filter:
•
COUT:
–
1 x GRJ32EC71E226KE11 22 µF 16 V (Murata)
–
1 x C3216X7R1H106K160AC 10 µF 50 V (TDK)
•
Inductor:
–
MSS1038T-333ML (Coilcraft)
•
C8:
–
10 pF
Figure 36. Efficiency VIN = 12 V; VOUT = 5 V; FSW = 0.4 MHz
0
10
20
30
40
50
60
70
80
90
100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
IOUT [A]
VIN = 12 [V]; VOUT = 5 [V]; F SW = 400 [KHz]
LCM
LNM
L6981
Efficiency curves
DS13554 - Rev 1
page 33/49



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